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Debt - Summary of Debt (Detail) - USD ($) | Sep. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024 | May 31, 2023 | Mar. 31, 2022 | Mar. 31, 2020 | Oct. 31, 2018 | Mar. 31, 2018 | Apr. 30, 2017 | Aug. 31, 2016 | Jan. 31, 2015 | Apr. 30, 2014 | Nov. 30, 2002 | Mar. 31, 1999
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Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt | [1] | $ 6,896,000,000 | $ 6,893,000,000 | $ 6,892,000,000 |  |  |  |  |  |  |  |  |  |  |
Fair value |  | 6,398,000,000 | 6,173,000,000 | 6,498,000,000 |  |  |  |  |  |  |  |  |  |  |
Senior Notes 2.45% Due 2027 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, face amount |  |  |  |  |  |  |  |  |  |  | $ 500,000,000 |  |  |  |
Debt, stated interest rate |  |  |  |  |  |  |  |  |  |  | 2.45% |  |  |  |
Long-term debt |  | 499,000,000 | 499,000,000 | 499,000,000 |  |  |  |  |  |  |  |  |  |  |
Fair value |  | 491,000,000 | 479,000,000 | 483,000,000 |  |  |  |  |  |  |  |  |  |  |
Senior Notes 2.50% Due 2027 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, face amount |  |  |  |  |  | $ 500,000,000 |  |  |  |  |  |  |  |  |
Debt, stated interest rate |  |  |  |  |  | 2.50% |  |  |  |  |  |  |  |  |
Long-term debt |  | 499,000,000 | 499,000,000 | 498,000,000 |  |  |  |  |  |  |  |  |  |  |
Fair value |  | 490,000,000 | 479,000,000 | 482,000,000 |  |  |  |  |  |  |  |  |  |  |
Senior Notes 6.625% Due 2029 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, face amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 300,000,000
Debt, stated interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.625%
Long-term debt |  | 298,000,000 | 298,000,000 | 298,000,000 |  |  |  |  |  |  |  |  |  |  |
Fair value |  | 323,000,000 | 320,000,000 | 330,000,000 |  |  |  |  |  |  |  |  |  |  |
Senior Notes 4.00% Due 2029 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, face amount |  |  |  |  |  |  |  | $ 550,000,000 |  |  |  |  |  |  |
Debt, stated interest rate |  |  |  |  |  |  |  | 4.00% |  |  |  |  |  |  |
Long-term debt |  | 548,000,000 | 547,000,000 | 547,000,000 |  |  |  |  |  |  |  |  |  |  |
Fair value |  | 550,000,000 | 534,000,000 | 549,000,000 |  |  |  |  |  |  |  |  |  |  |
Senior Notes 3.20% Due 2030 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, face amount |  |  |  |  |  |  | $ 500,000,000 |  |  |  |  |  |  |  |
Debt, stated interest rate |  |  |  |  |  |  | 3.20% |  |  |  |  |  |  |  |
Long-term debt |  | 498,000,000 | 498,000,000 | 498,000,000 |  |  |  |  |  |  |  |  |  |  |
Fair value |  | 481,000,000 | 462,000,000 | 476,000,000 |  |  |  |  |  |  |  |  |  |  |
Senior Notes 3.00% Due 2032 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, face amount |  |  |  |  |  | $ 500,000,000 |  |  |  |  |  |  |  |  |
Debt, stated interest rate |  |  |  |  |  | 3.00% |  |  |  |  |  |  |  |  |
Long-term debt |  | 497,000,000 | 497,000,000 | 497,000,000 |  |  |  |  |  |  |  |  |  |  |
Fair value |  | 461,000,000 | 439,000,000 | 458,000,000 |  |  |  |  |  |  |  |  |  |  |
Senior Notes 6.25% Due 2032 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, face amount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 400,000,000 |
Debt, stated interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.25% |
Long-term debt |  | 397,000,000 | 397,000,000 | 397,000,000 |  |  |  |  |  |  |  |  |  |  |
Fair value |  | 445,000,000 | 430,000,000 | 450,000,000 |  |  |  |  |  |  |  |  |  |  |
Senior Notes 4.95% Due 2033 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, face amount |  |  |  |  | $ 500,000,000 |  |  |  |  |  |  |  |  |  |
Debt, stated interest rate |  |  |  |  | 4.95% |  |  |  |  |  |  |  |  |  |
Long-term debt |  | 497,000,000 | 497,000,000 | 497,000,000 |  |  |  |  |  |  |  |  |  |  |
Fair value |  | 514,000,000 | 495,000,000 | 519,000,000 |  |  |  |  |  |  |  |  |  |  |
Senior Notes 4.35% Due 2044 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, face amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 350,000,000 |  |
Debt, stated interest rate |  |  |  |  |  |  |  |  |  |  |  |  | 4.35% |  |
Long-term debt |  | 347,000,000 | 347,000,000 | 347,000,000 |  |  |  |  |  |  |  |  |  |  |
Fair value |  | 308,000,000 | 298,000,000 | 319,000,000 |  |  |  |  |  |  |  |  |  |  |
Senior Notes 3.70% Due 2045 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, face amount |  |  |  |  |  |  |  |  |  |  |  | $ 400,000,000 |  |  |
Debt, stated interest rate |  |  |  |  |  |  |  |  |  |  |  | 3.70% |  |  |
Long-term debt |  | 396,000,000 | 396,000,000 | 396,000,000 |  |  |  |  |  |  |  |  |  |  |
Fair value |  | 320,000,000 | 308,000,000 | 331,000,000 |  |  |  |  |  |  |  |  |  |  |
Senior Notes 4.125% Due 2047 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, face amount |  |  |  |  |  |  |  |  |  | $ 850,000,000 |  |  |  |  |
Debt, stated interest rate |  |  |  |  |  |  |  |  |  | 4.125% |  |  |  |  |
Long-term debt |  | 843,000,000 | 842,000,000 | 842,000,000 |  |  |  |  |  |  |  |  |  |  |
Fair value |  | 716,000,000 | 684,000,000 | 750,000,000 |  |  |  |  |  |  |  |  |  |  |
Senior Notes 4.20% Due 2048 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, face amount |  |  |  |  |  |  |  |  | $ 600,000,000 |  |  |  |  |  |
Debt, stated interest rate |  |  |  |  |  |  |  |  | 4.20% |  |  |  |  |  |
Long-term debt |  | 591,000,000 | 591,000,000 | 591,000,000 |  |  |  |  |  |  |  |  |  |  |
Fair value |  | 510,000,000 | 490,000,000 | 532,000,000 |  |  |  |  |  |  |  |  |  |  |
Senior Notes 3.95% Due 2050 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, face amount |  |  |  |  |  |  | $ 500,000,000 |  |  |  |  |  |  |  |
Debt, stated interest rate |  |  |  |  |  |  | 3.95% |  |  |  |  |  |  |  |
Long-term debt |  | 492,000,000 | 491,000,000 | 491,000,000 |  |  |  |  |  |  |  |  |  |  |
Fair value |  | 404,000,000 | 386,000,000 | 420,000,000 |  |  |  |  |  |  |  |  |  |  |
Senior Notes 3.70% Due 2052 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, face amount |  |  |  |  |  | $ 500,000,000 |  |  |  |  |  |  |  |  |
Debt, stated interest rate |  |  |  |  |  | 3.70% |  |  |  |  |  |  |  |  |
Long-term debt |  | 494,000,000 | 494,000,000 | 494,000,000 |  |  |  |  |  |  |  |  |  |  |
Fair value |  | $ 385,000,000 | $ 369,000,000 | $ 399,000,000 |  |  |  |  |  |  |  |  |  |  |
[1] | Consists solely of long-term debt. See Note 4 – Debt for further discussion.

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